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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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LM3875-Gainclone-Chip-Amp-TF.JPG
LM3875-Gainclone-Chip-Amp-TF.JPGLM3875 DIY Gainclone / ChipAmp4674 viewsThe front view of my LM3875 Gainclone project. The layout and idea is from the LM3875 Gainclone in a Roasting Pan. The power transformer on top is from an old Yamaha subwoofer that quit working. Power supply capacitors are four 6800 uF and two 4700 uF which are snubbed. Power switch, LED and volume control are at the front.
Fostex-GK120-Speakers-with-F120A.jpg
Fostex-GK120-Speakers-with-F120A.jpgFostex GK120 Speakers with F120A4662 viewsHello - this is a hard to locate set of speakers! The cabinet is a rare speaker enclosure from Fostex - model GK120. The speaker in each cabinet is the famous F120A. The set operates flawlessly - both aesthetically as well as acoustically. The wood (though I do not know the type) is solid and very nice. The enclosures themselves are made of a see-through Lucite and are definitely a conversion piece.
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SV101481.JPGSubwoofer Analogue Processor4659 viewsThis OP amp based subwoofer processor is a kit available from the local Jaycar electronics shop. There is a lot of soldering and construction so it is not hard to miss a few solder joints. I did. On the first few listens I can see there is a lot of tuning and balancing to be had. I am using a monoblock chip amp / gainclone to provide the final power.
EL84-Push-Pull-Inside.jpg
EL84-Push-Pull-Inside.jpgDIY EL84 Push-Pull (PP) Tube Amplifier4658 viewsEL84 Push-Pull Tube Amplifier constructed following Bruce's DIY EL84 Push-Pull Tube Amplifier Project documentation.
LM3875-Gainclone-Chip-Amp-TR.JPG
LM3875-Gainclone-Chip-Amp-TR.JPGLM3875 Gainclone / Chip Amp with Baking Pan Enclosure4656 viewsThis LM3875 Gainclone was built following the basic idea around the LM3875 Gainclone in a Roasting Pan. The power transformer is from an old Yamaha subwoofer that stopped working. The power supply consists of four 6800 uF and two 4700 uF capacitors.
Underneath.JPG
Underneath.JPGJupiter Bees Wax and Paper Capacitors - OPA2134 Opamp Preamplifier4648 viewsWhen you get bored with high voltage valve amplifiers you start to look to other things to get your audio gear junky fix. I have always like the weird combos of materials in coupling/audio caps. I started with Jupiter Bees Wax and Paper caps and built a preamplifier around them. They are the dynamite sticks you can see. These are hand made and have silver connecting wire. Pure silver wire was used throughout and silver solder. Alps blue velvet attenuator and gold plated RCA add to a rich mix of components. The active bit is the Burr-Brown OPA2134 in milled sockets. Two sets of inputs are switchable and each channel has its own virtual power. This unit runs from a 26V 3.5A computer power pack. A timber suspended, tar and heavy Al foil dampened floor provides the base for the cct. brds. which sit on standoffs and are rubber grommet dampened. The lid and base of the thick die-cast aluminum case are also tar and foil lined.
EL84-SE-Tube-Amplifier.jpg
EL84-SE-Tube-Amplifier.jpgEL84 SE Tube Amplifier Project4611 viewsThis is my Single Ended EL84 / 6BQ5 Tube Amplifier project. See my webpage for the schematic. Half of a double triode tube (ECC88 / 6DJ8 or ECC82) amplify the input signal for each the EL84 / 6BQ5 tubes. The speakers in the background are also DIY and use a single Panasonic fullrange driver.
DIY-5687-Tube-Preamp-Rear.jpg
DIY-5687-Tube-Preamp-Rear.jpgDIY 5687 Tube Preamp - Rear View4603 viewsRear view of my first 5687 tube preamp project. It sounds great for such a simple preamp.
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpg
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82)4601 viewsThis is my finished STA1 tube preamp kit from Lighthouse Electric. This design uses three 12AU7 tubes. I prefer the 12AX7 tube preamp kit that I built over the STA1.
Audio-Research-VS55-Tube-Amp.jpg
Audio-Research-VS55-Tube-Amp.jpgAudio Research VS55 Tube Amplifier4593 viewsAudio Research VS55 tube amp. I didn’t buy this amp, but had it in my house for some listening tests. Quite impressive, but has a lot of background noise. Uses EH 6550 valves.
Wooden-5687-Valve-Preamplifier.jpg
Wooden-5687-Valve-Preamplifier.jpg5687 Valve Line Preamplifier4571 viewsThis is the second DIY 5687 Valve Preamplifier that I built. The enclosure is a DIY wooden box and painted black.
DIY-KT88-SE-Tube-Amplifier.jpg
DIY-KT88-SE-Tube-Amplifier.jpgKT88 Single Ended Tube Amp Build4551 viewsRear view of the KT88 Single Ended Tube Amplifier. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures are available on my build log for this project: SE KT88 Tube Amp.
6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg
6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg6C33C (6S33S) Single-Ended Valve Amplifier4543 views6C33C (6S33S) Single-Ended Valve Amplifier with 6E5P preamp valves. The power supply is external to the amplifier. Additional details for this valve amplifier are available in the 6C33C Tube Amplifier thread.
YAHA-Headphone-Amp.jpg
YAHA-Headphone-Amp.jpgYAHA Headphone Amplifier4534 viewsHere is on of my YAHA builds, I have never been a fan of Altoid tins. Later I used the Yaha voltage gain stage in my 12AU7 Tube / IRF612 MOSFET Hybrid Headphone Amplifier project.
Point_to_Point_Bride_of_Zen_Preamplifier.jpg
Point_to_Point_Bride_of_Zen_Preamplifier.jpgBoZoaC - Bride of Zen on a Cap4513 viewsAfter building a number of Bride of Zen (BoZ) preamplifiers I realised the whole circuit could be built on larger parts of itself. Here the whole BoZ circuit is constructed on the large output capacitors. The output caps are 10uF 100V polypropylene types. These were taped together along with two 1000uF of low ESR storage caps. Parts have been reduced to minimum size to keep signal path short and super glued to the rest on the cct. Silver solder and wirewrap wire is used throughout construction. There are two switchable inputs and the preamp can be powered by internal batteries (3 X 9V lithium) or an external supply. A bitumen and Al lined, non-magnetic low resonance ABS plastic case was used. Mongrel Dog Audio
DIY-KT88-Single-Ended-Tube-Amp~1.jpg
DIY-KT88-Single-Ended-Tube-Amp~1.jpgDIY KT88 Single Ended Tube Amp4506 viewsFront view of my KT88 Single Ended Tube Amplifier. The circuit follows Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures for this project are available on my build log: SE KT88 Tube Amp.
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00097.jpgEI Trans and rectifier4502 viewsStill in the building process, the EI transformer (24VCT @ 6amps) and the rectifiers (MUR860 diodes) and two 10000uF caps.
DIY-LM3875-Gainclone~0.jpg
DIY-LM3875-Gainclone~0.jpgDIY LM3875 Gainclone - rear view4496 viewsA gainclone chip amp with an external power supply. The design is based on my Roasting Pan LM3875 Gainclone Chip Amplifier. All wiring is point-to-point.
PB220014.JPG
PB220014.JPGPCL86 Single-Ended Amplifier4494 viewsSingle-ended amplifier using PCL86 triode / pentode tube

web: http://www.bartech.rulz.hu/
e-mail: kisskozsa@freemail.hu
Don-SE-807-Tube-Amplifier.jpg
Don-SE-807-Tube-Amplifier.jpgSingle-Ended 807 Tube Amplifier4492 viewsI have stated in the past that my mate Don makes an amp a month. This month Don has completed an 807 amp based on a schematic designed by Matt from the USA and the same as I built a short time back. I took a short listen and thought it OK but a much longer review is required. Don’s iron is wound by Dyne which is near us (Melbourne, Australia) and Don’s superb enclosure bases are made by him from, once more, Australian Spotted Gum. Top plate is once more ABS and OPTs are James. This not only a smart looking amp but with some high quality passives under the bonnet and again a very neat wiring layout. In this build JJ filters caps were used. Don has another amp in the pipeline so stayed tuned. About one month from now (lol).

Mark Houston – retro-thermionic
614 files on 31 page(s) 16


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